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# rewriteutil.py - utility functions for rewriting changesets
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#
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# Copyright 2017 Octobus <contact@octobus.net>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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from .i18n import _
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from . import (
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error,
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node,
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obsolete,
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revset,
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)
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def precheck(repo, revs, action=b'rewrite'):
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"""check if revs can be rewritten
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action is used to control the error message.
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Make sure this function is called after taking the lock.
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"""
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if node.nullrev in revs:
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msg = _(b"cannot %s null changeset") % action
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hint = _(b"no changeset checked out")
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raise error.Abort(msg, hint=hint)
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if len(repo[None].parents()) > 1:
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raise error.Abort(_(b"cannot %s while merging") % action)
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publicrevs = repo.revs(b'%ld and public()', revs)
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if publicrevs:
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msg = _(b"cannot %s public changesets") % action
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hint = _(b"see 'hg help phases' for details")
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raise error.Abort(msg, hint=hint)
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newunstable = disallowednewunstable(repo, revs)
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if newunstable:
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raise error.Abort(_(b"cannot %s changeset with children") % action)
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def disallowednewunstable(repo, revs):
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"""Checks whether editing the revs will create new unstable changesets and
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are we allowed to create them.
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To allow new unstable changesets, set the config:
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`experimental.evolution.allowunstable=True`
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"""
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allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
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if allowunstable:
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return revset.baseset()
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return repo.revs(b"(%ld::) - %ld", revs, revs)
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def skip_empty_successor(ui, command):
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empty_successor = ui.config(b'rewrite', b'empty-successor')
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if empty_successor == b'skip':
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return True
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elif empty_successor == b'keep':
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return False
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else:
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raise error.ConfigError(
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_(
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b"%s doesn't know how to handle config "
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b"rewrite.empty-successor=%s (only 'skip' and 'keep' are "
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b"supported)"
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)
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% (command, empty_successor)
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)
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